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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_001_014_2144">&nbsp;</a>NAME</h4><blockquote>
sum - print checksum and block count of a file (<b><a href="intro.html#tag_001_003_003">LEGACY</a></b>)
</blockquote><h4><a name = "tag_001_014_2145">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

sum <b>[</b>-r<b>][</b><i>file</i>...<b>]</b>
</code>
</pre>
</blockquote><h4><a name = "tag_001_014_2146">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>sum</i>
utility
calculates and writes a checksum for the named file
to standard output
and also writes the space used by the file, in 512-byte units.
</blockquote><h4><a name = "tag_001_014_2147">&nbsp;</a>OPTIONS</h4><blockquote>
The
<i>sum</i>
utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b>&nbsp;</a> .
The following options are supported:
<p>
<dl compact>

<dt><b>-r</b>
<dd>Use an alternative algorithm in computing the checksum.

</dl>
</blockquote><h4><a name = "tag_001_014_2148">&nbsp;</a>OPERANDS</h4><blockquote>
The following operands are supported:
<dl compact>

<dt><i>file</i><dd>A pathname of a file.
If no files are named, the standard input is read.

</dl>
</blockquote><h4><a name = "tag_001_014_2149">&nbsp;</a>STDIN</h4><blockquote>
The standard input is any type of file, used only if no
<i>file</i>
operands are specified.
</blockquote><h4><a name = "tag_001_014_2150">&nbsp;</a>INPUT FILES</h4><blockquote>
The input files are of any file type.
</blockquote><h4><a name = "tag_001_014_2151">&nbsp;</a>ENVIRONMENT VARIABLES</h4><blockquote>
The following environment variables may affect the execution of
<i>sum</i>:
<dl compact>

<dt><i>LANG</i><dd>Provide a default value for the internationalisation variables
that are unset or null.
If
<i>LANG</i>
is unset or null, the corresponding value from the
implementation-dependent default locale will be used.
If any of the internationalisation variables contains an invalid setting, the
utility will behave as if none of the variables had been defined.

<dt><i>LC_ALL</i><dd>
If set to a non-empty string value,
override the values of all the other internationalisation variables.

<dt><i>LC_CTYPE</i><dd>
Determine the
locale for the interpretation of sequences of bytes of text data as
characters (for example, single- as opposed to multi-byte characters
in arguments).

<dt><i>LC_MESSAGES</i><dd>
Determine the locale that should be used to affect
the format and contents of diagnostic
messages written to standard error.

<dt><i>NLSPATH</i><dd>
Determine the location of message catalogues
for the processing of
<i>LC_MESSAGES .
</i>
</dl>
</blockquote><h4><a name = "tag_001_014_2152">&nbsp;</a>ASYNCHRONOUS EVENTS</h4><blockquote>
Default.
</blockquote><h4><a name = "tag_001_014_2153">&nbsp;</a>STDOUT</h4><blockquote>
For each file processed successfully,
<i>sum</i>
writes a line of the following format:
<p><code>
<tt>"%u %d %s\n"</tt>, &lt;<i>checksum</i>&gt;,
&lt;<i>number&nbsp;of&nbsp;512-byte&nbsp;units</i>&gt;,
&lt;<i>pathname</i>&gt;
</code>
<p>
If the standard input is used for input, the pathname is omitted.
</blockquote><h4><a name = "tag_001_014_2154">&nbsp;</a>STDERR</h4><blockquote>
Used only for diagnostic messages.
</blockquote><h4><a name = "tag_001_014_2155">&nbsp;</a>OUTPUT FILES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_2156">&nbsp;</a>EXTENDED DESCRIPTION</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_2157">&nbsp;</a>EXIT STATUS</h4><blockquote>
The following exit values are returned:
<dl compact>

<dt>0<dd>Successful completion.

<dt>&gt;0<dd>An error occurred.

</dl>
</blockquote><h4><a name = "tag_001_014_2158">&nbsp;</a>CONSEQUENCES OF ERRORS</h4><blockquote>
Default.
</blockquote><h4><a name = "tag_001_014_2159">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
It is not clear that the algorithms used in typical implementations
are portable, that is, the same checksum might not be produced
for the same input on
different systems.
Portable applications should use
<i><a href="cksum.html">cksum</a></i>.
</blockquote><h4><a name = "tag_001_014_2160">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_2161">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_2162">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="cksum.html">cksum</a></i>.
<br>
</blockquote><hr size=2 noshade>
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]

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